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Chapter 10: Game Mastering / Environment / Natural Disasters

Collapses

Source Core Rulebook pg. 518 1.1
Collapses and cave-ins occur when caverns or buildings fall, dumping tons of rock or other material on those caught below or inside them. Creatures under the collapse take major or massive bludgeoning damage and become buried, just as with an avalanche. Fortunately, collapses don’t spread unless they weaken the overall integrity of the area and lead to further collapses.